/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.http.client;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;

import java.io.IOException;
import java.net.URI;
import java.util.List;
import java.util.Map;

/**
 * {@link org.springframework.http.client.ClientHttpRequest} implementation that uses
 * Apache HttpComponents HttpClient to execute requests.
 *
 * <p>Created via the {@link HttpComponentsClientHttpRequestFactory}.
 *
 * @author Oleg Kalnichevski
 * @author Arjen Poutsma
 * @see HttpComponentsClientHttpRequestFactory#createRequest(URI, HttpMethod)
 * @since 3.1
 */
final class HttpComponentsClientHttpRequest extends AbstractBufferingClientHttpRequest {

    private final HttpClient httpClient;

    private final HttpUriRequest httpRequest;

    private final HttpContext httpContext;


    public HttpComponentsClientHttpRequest(HttpClient httpClient, HttpUriRequest httpRequest, HttpContext httpContext) {
        this.httpClient = httpClient;
        this.httpRequest = httpRequest;
        this.httpContext = httpContext;
    }


    public HttpMethod getMethod() {
        return HttpMethod.valueOf(this.httpRequest.getMethod());
    }

    public URI getURI() {
        return this.httpRequest.getURI();
    }


    @Override
    protected ClientHttpResponse executeInternal(HttpHeaders headers, byte[] bufferedOutput) throws IOException {
        for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
            String headerName = entry.getKey();
            if (!headerName.equalsIgnoreCase(HTTP.CONTENT_LEN) &&
                    !headerName.equalsIgnoreCase(HTTP.TRANSFER_ENCODING)) {
                for (String headerValue : entry.getValue()) {
                    this.httpRequest.addHeader(headerName, headerValue);
                }
            }
        }
        if (this.httpRequest instanceof HttpEntityEnclosingRequest) {
            HttpEntityEnclosingRequest entityEnclosingRequest = (HttpEntityEnclosingRequest) this.httpRequest;
            HttpEntity requestEntity = new ByteArrayEntity(bufferedOutput);
            entityEnclosingRequest.setEntity(requestEntity);
        }
        HttpResponse httpResponse = this.httpClient.execute(this.httpRequest, this.httpContext);
        return new HttpComponentsClientHttpResponse(httpResponse);
    }

}
